Well, he certainly had teenagers manning AA guns and so on in the final days of the war.
I think I remember a story of how two 14 year olds were manning a gun turret and were asked to surrender by the US. They refused and got blown up.
Still, I think that the biggest mistake that Hitler ever made was Russia. I actually believe that without the USA's involvement in the war, the Russians would have defeated Hitler.
Also, don't go on about multi-front wars, Hitler was only fighting on one front for at least a year of Operation Barbarossa (Invasion of Russia - started in 1941), and he was pouring all of his resources into that war with the Soviets. By mid-1942, the Russians were already turning the tables on Germany before they were fighting the Allies anywhere else but in North Africa (where they had the Allies pinned down until August -> November 1942 - Battle of El Alamein).
It's true that after 1943, Hitler was fighting on more than two fronts (Russia, Southern Italy and Holland during Operation Market Garden), but the Germans were by now on the defensive on every front.
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I remembering hearing about that the Soviets could of take on Hitler by themselves, I can't remember where I heard that from.